A Full-Body Strengthening Workout That Doesn't Require a Single Weight

Do this program, which was designed by Olson, four times a week for six weeks. In that time you'll get stronger overall, which translates to a tighter physique, says Olson. Because the moves can be done anywhere, you can fit in this workout on the fly, even if you’re stuck on a conference call or in a far-flung hotel.